期刊
MICROSCOPY AND MICROANALYSIS
卷 18, 期 6, 页码 1380-1388出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S143192761201344X
关键词
scanning transmission electron microscopy; low electron energy; HAADF; organic solar cell; P3HT; PCBM; nanomorphology
资金
- Ministry of Science, Research and the Arts of Baden-Wurttemberg [Az: 7713.14-300]
- DFG [1355, GE 841/20]
In this study the nanomorphology of P3HT:PC61BM absorber layers of organic solar cells was studied as a function of the processing parameters and for P3HT with different molecular weight. For this purpose we apply scanning transmission electron microscopy (STEM) at low electron energies in a scanning electron microscope. This method exhibits sensitive material contrast in the high-angle annular dark-field (HAADF) mode, which is well suited to distinguish materials with similar densities and mean atomic numbers. The images taken with low-energy HAADF STEM are compared with conventional transmission electron microscopy and atomic force microscopy images to illustrate the capabilities of the different techniques. For the interpretation of the low-energy HAADF STEM images, a semiempirical equation is used to calculate the image intensities. The experiments show that the nanomorphology of the P3HT:PC61BM blends depends strongly on the molecular weight of the P3HT. Low-molecular-weight P3HT forms rod-like domains during annealing. In contrast, only small globular features are visible in samples containing high-molecular-weight P3HT, which do not change significantly after annealing at 150 degrees C up to 30 min.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据